UPSA Object Registry

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Umbriel

Natural satellite JPL Horizons

Density: 1.52 g cm^-3
Orbital period: 4.144 d
Geometric albedo: 0.18

Also known as

2 identifiers

Horizons 702UII

Recorded parameters

9 quantities with a single published value

Parameter	Value	Unit	Uncertainty	As published	Source	Reference
Density	1.52	g cm^-3		Density (g cm^-3)	JPL Horizons	JPL Horizons on-line ephemeris system
Orbital period	4.144	d		Orbital period	JPL Horizons	JPL Horizons on-line ephemeris system
Geometric albedo	0.18			Geometric Albedo	JPL Horizons	JPL Horizons on-line ephemeris system
GM	85.4	km^3/s^2		GM (km^3/s^2)	JPL Horizons	JPL Horizons on-line ephemeris system
Eccentricity e	0.005	e		Eccentricity, e	JPL Horizons	JPL Horizons on-line ephemeris system
Inclination i deg	179.64	deg		Inclination, i (deg)	JPL Horizons	JPL Horizons on-line ephemeris system
Radius km	584.7	km		Radius (km)	JPL Horizons	JPL Horizons on-line ephemeris system
Rotational period	Synchronous			Rotational period	JPL Horizons	JPL Horizons on-line ephemeris system
Semi major axis a km	266	km		Semi-major axis, a (km)	JPL Horizons	JPL Horizons on-line ephemeris system

Provenance

where this card came from

Archive	Read at (UTC)	Record
JPL Horizons	2026-08-14 17:10	open at source

Machine-readable: /api/v1/object/umbriel · Registry entry updated 2026-08-14.